Coiling device for making an electrode assembly and methods of use

ABSTRACT

A system for the automated coiling of a jelly roll electrode assembly for controlled assembly and tensioning of jelly roll assembly is provided. The system includes: a shuttle, and a mandrel to which electrodes are welded; a base, mateable with the shuttle and on which the battery head assembly is mounted for welding to the mandrel; and a coiling device. The coiling device has an upper spool, a lower spool, holding a separator strip and a platform between the two holding the base. The separator strip is threaded through a passage in the mandrel separating positive and negative portions. Rotating the mandrel coils the positive electrode, the separator strip and the negative electrode to coil around the mandrel. The coiling device may include a feedback loop braking one or both spools and allowing the coiling tension to be programmed to a desired level.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 U.S.C. §119(e) to U.S.Provisional Patent Application Ser. No. 61/390,431, filed Oct. 6, 2010,the contents of which is incorporated herein by reference in itsentirety.

FIELD OF THE INVENTION

The invention relates to an automated battery assembly system utilizinga mandrel that allows for increased compactness and reproducibility.

BACKGROUND OF THE INVENTION

Batteries for medical devices have demanding requirements. They shouldbe small, have a long life, high power output, low self-discharge rate,compact size and high reliability. The need for miniaturization whilemaintaining or increasing output means that as much of the batteryfootprint as possible should be used for power storage resulting in theconcomitant elimination of dead space. However, while the elimination ofdead space should result in greater miniaturization, it also results ina greater difficulty of assembly due to the increasingly small size ofthe component parts.

Traditionally, jelly roll type batteries have been made by using amandrel to wrap electrodes around. Once wrapped, the mandrel is removedproviding a jelly roll wrapped electrode assembly for use in a battery.However, removal of the mandrel from the core of the jelly rollinherently presents the potential of damaging the jelly roll due to thepossibility of pulling the core of the jelly roll out with the mandrel.Therefore, the jelly roll should not be wrapped tight to avoid thisproblem. Conversely, a loosely wrapped jelly roll wastes space anddecreases battery capacity and power due to size constraints. Morerecently, jelly roll storage batteries have been made using arod-shaped, non-conductive, non-deformable core around which electrodesare wrapped. Conductive tabs are added to each electrode to complete thecircuit.

U.S. Pat. No. 7,442,465 to Kim et al., discloses a rechargeable batterywhich has a non-deformation core. Once the positive and negativeelectrodes are wound around the core, conductive tabs are attached tothe electrodes and the core serves to prevent deformation of the jellyroll, but does not conduct current.

U.S. provisional patent application 60/348,665 to Nakahara et al.describes a feedthrough pin that is directly connected to an inner endof an electrode. The pin extends from the jelly roll and through thebattery case and functions as a battery terminal. The feedthrough pinfits into a slotted ‘C’-shaped mandrel. The positive electrode isconductively connected to the pin which fits within the ‘C’-shapedmandrel. As the positive electrode is wound, a separator is insertedbetween the feedthrough pin/mandrel and the positive electrode. Anegative electrode is inserted between the separator and thepin/mandrel. The separator and negative electrode are held in the jellyroll by the tension created between the feedthrough pin/mandrel and thepositive electrode. After winding, a metal tab is welded to the negativeelectrode and the tab contacts the battery case endcap to complete thecircuit.

Oftentimes the coiling of the jelly roll can be complicated bytelescoping of the coil, making the process inefficient. In otherinstances, the jelly roll cannot be used due to deformation or tearingof the roll occurring during the coiling process.

Therefore, a need still exists for improved methods to coil jelly rollassemblies.

BRIEF SUMMARY OF THE INVENTION

The present invention provides a device for the automated coiling of ajelly roll electrode assembly. Advantages of the device includecontrolled and consistent tension of the coiled jelly roll assemblyduring fabrication. The device provides a coiling device that includes awinding apparatus, an upper spool and a lower spool holding a separatorstrip and a platform that can hold a base and shuttle which in turnsupports a battery mandrel. The base, shuttle and mandrel are placed onthe platform which is located between the upper and lower spools.

The mandrel is conductively connected to positive and negativeelectrodes with the separator strip threaded through a passage (e.g., anopening) in the mandrel separating positive and negative portions of themandrel. Upon rotating the mandrel with the winding apparatus, thepositive electrode, the separator strip and the negative electrode arecoiled around the mandrel providing a jelly roll electrode assembly.

The device can also include a feedback loop between a brake on one orboth spools and the winding apparatus to allow tensioning of the windingapparatus to be programmed to a desired level.

In one embodiment, the invention provides an apparatus to hold a batterymandrel for jelly roll fabrication. The apparatus includes a base and ashuttle. The base includes a right member and a left member connected bya central member wherein the central member is configured to accept anelectrode assembly head piece (electrode assembly header) for a battery.The shuttle, includes a right portion and a left portion connected by acenter portion. The left portion includes a cover, the right portionincludes a cover, and the center portion is configured to accept themandrel. The left and right covers are positioned on opposite sides ofthe shuttle. The base is configured to mate with the shuttle, such thatthe mandrel is secured between the center portion of the shuttle andcentral member of the base.

In another aspect, the invention includes a coiling device for preparingan electrode assembly. The coiling device includes: a) a windingapparatus; b) a platform on the coiling device configured to hold anunwound battery assembly, including a battery mandrel; c) a first spool,wherein the first spool provides a separator strip; d) a second spool,wherein the second spool accepts the separator strip; and e) one or moreheating elements.

The invention also provides a method of making an electrode assembly.The method includes providing the battery mandrel having a positiveportion, a negative portion and a removable portion connecting thepositive portion to the negative portion. A passage is included betweenthe positive portion and the negative portion of the mandrel. A ligatureis provided to hold the battery mandrel. The ligature is configured, ata first end to secure the removable portion of the battery mandrel. Themethod also provides passing a stem on a second end of the ligaturethrough a drive hole in a shuttle, the shuttle comprising a rightportion and a left portion connected by a center portion.

A positive electrode is disposed in the right portion of the shuttle sothat an end of the electrode contacts a positive portion of the mandrel.A negative electrode is disposed in the left portion of the shuttle sothat an end of the negative electrode contacts a negative portion of themandrel. The positive electrode and the negative electrode are welded,respectively, to the positive portion of the mandrel and the negativeportion of the mandrel. The method also includes a base having a centralmember with a rotating assembly. An electrode assembly header is placedin a drive barrel which includes a drive stem configured to mate withthe rotating assembly of the base. The shuttle is mated with the baseand the head piece is welded to the mandrel. The base is mounted on acoiling device such that the stem of the ligature is connected to awinding apparatus. A separator strip is passed through the passagebetween the positive portion of the mandrel and the negative portion ofthe mandrel. The mandrel is rotated such that the positive electrode,separator strip and negative electrode are coiled around the mandrel toform a jelly roll. An exposed end of the separator strip is affixed toan outer layer of separator strip of the jelly roll such that the coilis sealed. A coiled jelly roll electrode assembly is thereby provided.

While multiple embodiments are disclosed, still other embodiments of thepresent invention will become apparent to those skilled in the art fromthe following detailed description. As will be apparent, the inventionis capable of modifications in various obvious aspects, all withoutdeparting from the spirit and scope of the present invention.Accordingly, the detailed descriptions are to be regarded asillustrative in nature and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of one exemplary embodiment of a coilingdevice according to the invention. The coiling device allows for theautomated wrapping of the battery electrodes and separator strip arounda mandrel.

FIG. 2 illustrates a base used to adapt the platform of the coilingdevice of FIG. 1 to hold the battery assembly before winding.

FIGS. 3A and 3B illustrate two different views of a shuttle useful inholding the battery assembly for winding and configured to fit into thebase piece illustrated in FIG. 2.

FIG. 4 is a close-up view of a portion of the shuttle illustrated inFIGS. 3A and 3B

FIG. 5 illustrates how the shuttle, with electrode assembly componentsin place, mates with base plate prior to insertion into the coilingdevice.

FIGS. 6A and 6B illustrate a mandrel according to one embodiment of theinvention. FIG. 6A is a side-plan view of the mandrel. FIG. 6B is atop-plan view of the mandrel of FIG. 6A.

FIG. 7 illustrates a ligature used to secure a mandrel into the shuttleillustrated in FIG. 5.

FIG. 8 illustrates the mandrel being fitted into the ligature shown inFIG. 7.

FIG. 9 illustrates the mandrel-carrying shuttle inserted into anultrasonic welding device used to attach the positive and negativeelectrodes to the mandrel.

FIG. 10 is a schematic diagram of the mandrel illustrated in FIGS. 6-9after the electrodes are attached to the positive portion and thenegative portion of the mandrel.

FIGS. 11A and 11B illustrate the use of a header drive barrel used tocarry the electrode assembly header comprising a battery cover andpositive and negative feedthrough pins for attachment to the mandrel.

FIG. 12 illustrates the mandrel being prepared for the attachment offeedthrough pins. In this view, the shuttle, with a mandrel havingelectrodes attached, is mated to the base and loaded in a hold-down toolfor insertion into a laser welder to attach the feedthrough pins to themandrel.

FIG. 13 provides an aspect shown in FIG. 10 but with a clamp on thehold-down tool closed over the feedthrough pins in readiness for weldingthe pins to the mandrel.

FIG. 14 illustrates the mandrel secured in the shuttle/base carrier withelectrodes and feedthrough pins attached and ready for insertion in thecoiling device.

FIG. 15 illustrates the coiling device prior to insertion of theshuttle/base carrier.

FIG. 16 illustrates the shuttle/base carrier having been inserted intothe coiling device and a separator strip being threaded through apassage formed in the mandrel between the positive portion and thenegative portion.

FIG. 17 illustrates the electrode assembly prepared for winding in thecoiler.

FIG. 18 illustrates the coiled electrode assembly with the remainder ofthe separator strip being sealed to the jelly roll by heating elements.

FIG. 19 is a front-plan view of one embodiment of a coiling deviceaccording to the invention. The figure illustrates the coiling deviceconfigured for automation with a human machine interface for theprogrammed coiling of a jelly roll electrode assembly.

FIG. 20 illustrates the completed jelly roll assembly before removal ofthe removable portion of the mandrel.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

In General

In the specification and in the claims, the terms “including” and“comprising” are open-ended terms and should be interpreted to mean“including, but not limited to . . . . ” These terms encompass the morerestrictive terms “consisting essentially of” and “consisting of.”

It must be noted that as used herein and in the appended claims, thesingular forms “a”, “an” and “the” include plural reference unless thecontext clearly dictates otherwise. As well, the terms “a” (or “an”),“one or more” and “at least one” can be used interchangeably herein. Itis also to be noted that the terms “comprising”, “including”,“characterized by” and “having” can be used interchangeably.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meanings as commonly understood by one of ordinary skillin the art to which this invention belongs. All publications and patentsspecifically mentioned herein are incorporated by reference in theirentirety for all purposes including describing and disclosing thechemicals, instruments, statistical analyses and methodologies which arereported in the publications which might be used in connection with theinvention. All references cited in this specification are to be taken asindicative of the level of skill in the art. Nothing herein is to beconstrued as an admission that the invention is not entitled to antedatesuch disclosure by virtue of prior invention.

As used herein, the term “mandrel” means an interior core at least aportion of which can be an integral part of the electrode assembly. Theterm “interconnect joint” refers to a conductive connection between theelectrical components of a battery including a mandrel. While themandrel may, itself not be conductive, those parts of the electrodeassembly required for an electric current, including, at least, positiveand negative electrodes and positive and negative feedthrough pins areconductively connected on the mandrel. In addition, the term “electrode”is used to refer to an electrode substrate that can be coated with anactive material. The electrode can include a current collectingsubstrate in the form of multiple “plates” or panels conductivelyconnected to each other. Alternatively, the electrode comprises asubstrate in the form of a strip of thin conductive material such as afoil. When the electrode is formed using a foil or thin conductive stripas a substrate, the electrode can be considered an “electrode strip”.

As used herein the terms “heat sealed” and “heat sealer” refer toconventional methods known in the art in which a machine applies heat toseal a material such as a thermoplastic material. Of the several typesof heat sealers, one is a continuous heat sealer that applies acontinuous heat. A continuous heat device or sealer can be constructedusing a cartridge heater that is inserted into an appropriate sizeopening in a block, such as metal or ceramic, having a predeterminedshape and desirable thermal properties. A second type of heat sealer isan impulse heat sealer. Generally, an impulse heat sealer uses astationary element (such as a nichrome wire) that is heated by passing acurrent through it for a period of time.

The invention will be further described with reference to the followingnon-limiting embodiments. It will be apparent to those skilled in theart that many changes can be made in the embodiments described withoutdeparting from the scope of the present invention. Thus the scope of thepresent invention should not be limited to the embodiments described inthis application, but only by embodiments described by the language ofthe claims and the equivalents of those embodiments. Unless otherwiseindicated, all percentages are by weight.

The Invention

The present invention provides a device for the automated coiling of ajelly roll electrode assembly. Advantages of the present inventioninclude a controlled and consistent tension of the coiled jelly rollassembly during winding. The system provides a coiling device thatincludes a winding apparatus, an upper spool and a lower spool holding aseparator strip and a platform holding a base and shuttle that support abattery mandrel. The mandrel is conductively connected to positive andnegative electrodes with the separator strip threaded through a passagein the mandrel separating positive and negative portions connected by aremovable portion. The positive electrode, the separator strip and thenegative electrode are coiled around the mandrel when the mandrel isrotated to provide a jelly roll electrode assembly. The device alsoincludes a feedback loop between a brake on one or both spools and thewinding apparatus to allow the tension of the winding apparatus to beprogrammed to a desired level.

The present invention provides a device and process for the assembly andautomated coiling of a jelly roll electrode assembly providing forcontrolled and consistent tension of the coiled jelly roll assembly. Thesystem includes a shuttle configured to hold a mandrel with positive andnegative electrodes attached to the mandrel. The system also includes abase piece that is mateable with the shuttle and holds a electrodeassembly header. The electrode assembly header comprises the batterycover and positive and negative feedthrough pins. Once the shuttle ismated with the base piece, the feedthrough pins are welded to thepositive and negative portions of the mandrel. The system furtherprovides a coiling device on which the mandrel assembly is mounted. Thecoiling device includes a winding apparatus, an upper spool and a lowerspool holding a separator strip and a coiler platform holding the baseand shuttle that contain the mandrel assembly. Docking of thebase/shuttle with the coiler platform engages a ligature holding abottom portion of the mandrel with a drive shaft on the coiler and asecondary drive shaft in the base piece that, connected by a drive belt,engages a rotating portion of the base holding the electrode assemblyheader on the mandrel. The separator strip is threaded through a passagein the mandrel separating the positive and negative portions of themandrel. Rotation of the mandrel causes the positive electrode, theseparator strip and the negative electrode to coil around the mandrel toprovide a jelly roll electrode assembly. The coiling device alsoincludes a feedback loop between a brake on one or both spools and thewinding apparatus allowing the tension of the winding apparatus to beprogrammed to a desired level.

Referring now to FIG. 1, a coiling device 10 according to the inventionis illustrated. The coiling device comprises a winding apparatus 20 anda platform 30 configured to hold a base piece 60 and shuttle 100. Basepiece 60 and shuttle 100 are adapted to hold a mandrel (not shown) usedin making a jelly roll electrode assembly. Also shown are a first spool32 and a second spool 34 used to provide and hold a separator strip 36used in making the jelly roll electrode assembly. The separator stripgenerally has a backing 40. Backing 40 is taken up on an uptake spool 38when the separator strip is unwound.

In one aspect, the base/shuttle 60/100 assembly is fitted onto platform30 and separator strip 36 is threaded around upper guide rollers 42 anda tension roller 46 through a passage in the mandrel around lower guiderollers 44 and a lower tension roller 48 and wound onto the second spool34. The coiling device 10 can also include upper and/or lower heatingelements 50 and 52. When the jelly roll assembly is coiled, the heatingelements cut separator strip 36 and seal an outer layer of separatorstrip 36 to itself, sealing the jelly roll electrode assembly 200 (notshown). Also illustrated is a light curtain 56, that provides a safetyfeature and can be used to stop the automated coiling process should theplane of the light curtain be broken by any object.

Light curtain 56 provides an alternative to a mechanical barrier inguarding the operation of the winder and providing a safety mechanismfor users. Light curtain 56 is positioned about the perimeter of coilingdevice 10. Light curtain 56 is an optoelectronic device that includestwo members. One member is a transmitter and the other member is areceiver. The transmitter projects an array of parallel infrared lightbeams to the receiver which consists of a number of photoelectric cells.When an object breaks one or more of the beams a stop signal is sent tothe coiler and to resume operation, the coiler must be re-started.

FIG. 2 illustrates base 60 according to one embodiment of the invention.Base 60 includes a right member 62 and left member 64 joined by acentral member 80 including a rotatable member 70. Also shown are aright flange 66 and a left flange 68 supporting shuttle 100 (FIG. 3)when base 60 and shuttle 100 are mated. In some embodiments, base 60also includes a secondary drive shaft 72 operationally connected to adrive belt 74 that is in communication with rotatable portion 70.Rotatable portion 70 can be configured to mate with a drive barrelholding a electrode assembly header (not shown). In addition, base 60can further include orientation pins 76 dimensioned and configured tomate with orientation holes on the shuttle 100 (not shown). In thisembodiment, orientation holes 78 secure base 60 on the coiling device 10by mating with locking pins 54 (not shown) on both sides of platform 30.

FIGS. 3A and 3B illustrate two different views of one embodiment ofshuttle 100. Shuttle 100 includes a right portion 102 and a left portion104 connected by a center portion 106 but discontinuous with each otherso as to provide a slot 108 dimensioned to accept a mandrel 130 (shownin FIG. 3A as a coiled jelly roll assembly 180).

Also illustrated are a left main cover 114 and a left secondary cover116 closeable over left portion 104 of shuttle 100. On the other face ofshuttle 100 is a right main cover 118 and right secondary cover 120closeable over the right portion 102 of shuttle 100. Covers 114, 116,118 and 120 can be secured to shuttle 100 via a hinge or other suitablemeans for attachment.

FIG. 4 is an enlarged view of left portion 104 and center portion 106 ofshuttle 100. Right portion 102 has the same configuration as the leftportion 104 but the main cover 114 and secondary cover 116 are onopposite faces of shuttle 100. Because left portion 104 and rightportion 102 are discontinuous with each other, a space or slot 108 formandrel 130 is provided there between. Also shown is a passage or drivehole 112 dimensioned and configured to accept a stem 146 of ligature 140(not shown) used to hold mandrel 130 in shuttle 100. Shuttle 100 canalso include an electrode track 128 dimensioned and configured to acceptan electrode (not shown). Both left main cover 114 and secondary cover116 can also have closure magnets 126 embedded therein that areconfigured to mate with closure magnets 127 on shuttle 100 to allowsecure positioning of electrodes when contained therein. Also shown areholes 124 present on both the right portion 102 and left portion 104 ofshuttle 130 that mate with orientation pins 76 on the right member 62and left member 64 of base 60. Those of skill in the art will alsoappreciate that force with which the cover is secured to the shuttle canbe varied by using magnets with greater or lesser strength.

Those of skill in the art will appreciate that a unitary cover for eachportion of the shuttle can be used. However, the inventors have foundthat providing distal secondary covers allows for adjustable placementof the electrodes 160 and 162 in tracks 128. Any releasable method ofsecuring the cover on the shuttle is acceptable. Such other methods mayinclude a latch and hasp, hook and loop or the like. In use, theelectrodes 160 and 162 are placed in their respective tracks and maincovers 114 and 118 can be closed. The distal ends of electrodes 160 and162 remain exposed by the open secondary covers 116 and 120 and can beadjusted. After final positioning of electrodes 160 and/or 162,secondary covers 116, 120 can be closed. It should be understood thatelectrodes 160 and 162 are thus placed on opposite sides of shuttle 100.

FIG. 5 illustrates shuttle 100 being mated with base 60 with mandrel 30secured in mandrel slot 108 by ligature 140. As discussed for FIG. 2,shuttle 100 sits on base piece flanges 66 and 68 and is secured byorientation pins 76 on the base, mating with orientation holes 124 (notshown) on the shuttle thereby providing correct orientation of shuttle100 to base 60.

FIGS. 6A and 6B illustrate one embodiment of mandrel 130 useful with theinvention. See also, U.S. provisional patent applications 61/321,677,61/321,685, 61/321,693 and 61/321,703 incorporated herein by referencefor all purposes. Mandrel 130 is planar having two faces. Mandrel 130has a positive portion 132 and a negative portion 134 with a passage “p”separating the two portions. In addition, mandrel 130 also has removableportion 136 and perforation 138. Also shown are positive feedthroughgroove 133 and negative feedthrough groove 135.

FIG. 6B is a top-plan view of mandrel 130 showing the mid-line ofmandrel 130, along line ‘m-m’. As illustrated in FIG. 6B, feedthroughgrooves 133 and 135 are dimensioned and configured to accept feedthroughpins 164 and 166 (see, FIGS. 11A and 11B). As illustrated in FIGS. 6Aand 6B, positive feedthrough groove 133 is placed closer to midline‘m-m’ of mandrel 130 than negative feedthrough groove 135. This isillustrated by the distance ‘d’ from positive feedthrough groove 133 tothe midline compared to the distance ‘d1’ from negative feedthroughgroove 135 to midline ‘m-m’. Of course, those of skill in the art willappreciate that the placement of the grooves can be equidistant from themidline. Alternatively, the negative feedthrough groove can be closer tothe mid-line, if desired, or the grooves can be placed at any convenientlocation of the mandrel 130 as needed. However, those of skill in theart will appreciate that by having the feedthrough pins positioned attwo different distances from the midline, a battery cover (not shown)can be constructed to fit over the electrodes (not shown) in only oneposition. This assures that the terminals can be easily identifiable aspositive and negative.

Further, as shown in FIG. 6A, removable portion 136 can be separatedfrom positive portion 132 and negative portion 134 by perforation 138.Perforation 138 can be deep enough such that mandrel 130 can be brokenalong perforation 138 after electrode assembly. This results inindividual positive and negative portions 132 and 134 of mandrel 130.Also illustrated in FIG. 6A is an orientation notch 137 shown as afoot-type aperture on the midline of mandrel 130. In the embodimentshown, the “foot” points toward negative portion 134 of mandrel 130.Those of skill in the art will realize that such orientation guides arenot necessary for mandrel 130 to function nor do they have to pointtowards the negative portion of the mandrel. However, such guides arehelpful if consistently used.

While the mandrel 130 can be formed of any material that allows aconnection between the electrodes 160, 162 and the feedthrough pins 164,166, in some exemplary embodiments, the mandrel 130 is formed of aconductive material. In these embodiments, mandrel 130 can be formed ofany conductive material. For example, the mandrel can be formed ofstainless steel or aluminum. Alternatively, mandrel 130 can be made frompure titanium or titanium alloy such as grade 5 or grade 23, nickel,copper and combinations thereof.

While mandrel 130 can be made using any appropriate process, in oneaspect mandrel 130 can be made using electric discharge machining (EDM).Alternatively, mandrel 130 can be made by metal extrusion or byinjection molding depending on the needs of the battery and thecomposition of the mandrel. Grooves 133 and 135 for the feedthrough pins164 and 166 can be made in mandrel 130 by machining, etching, or othersuitable methods to provide a groove.

The width of mandrel 130 can be from about 0.2 to about 0.5 inches, moreparticularly from about 0.25 to about 0.4 inches and most particularlyfrom about 0.3 to about 0.35 inches. Generally, the length of mandrel130 ranges from about 0.5 inches to about 1 inch, more particularly fromabout 0.6 to about 0.8 inches and most particularly from about 0.7 toabout 0.75 inches. The thickness of mandrel 130 ranges from about 0.01to about 0.05 inches, more particularly from about 0.015 inches to about0.03 inches and most particularly from about 0.02 to about 0.030 inches.

FIG. 7 illustrates a ligature 140 dimensioned and configured to securelyhold mandrel 130 in shuttle 100. As illustrated, ligature 140 comprisestwo halves 142 and 144 movably connected by ligature pin 148. Each halfof ligature 140 includes a body portion 154. One of the halves 142 or144 can be configured to include an interior space dimensioned to acceptmandrel 130 and include an orientation guide 150 dimensioned andconfigured to accept a corresponding orientation notch 137 in mandrel130 (FIG. 6A). A stem portion 146 of ligature 140 can be dimensioned andconfigured to pass through drive hole 112 of shuttle 100. Ligature 140can also include securement means 152 mateable with a ball dententfeature (not shown) in drive hole 112. In FIG. 7, the securement meansis a hole 152 that accepts a corresponding pin (not shown) on the secondhalf 142 of ligature 140 such that when ligature 140 is closed andligature stem 146 is inserted in the drive hole 112 of shuttle 100, themandrel 130 is secured inside the ligature 140.

FIG. 8 illustrates mandrel 130 placed into a first half 144 of ligature140. The orientation notch 137 in the removable portion 136 of mandrel130 mates with the orientation guide 150 in the first half 144 of theligature 140. The second half 142 of ligature 140 is then rotated aboutligature pin 148 and closed over mandrel 130 and stem 146 of ligature140 is then placed through drive hole 112 of shuttle 100 (shown in FIG.5). The fluted end of the stem 146 then protrudes from the drive hole112 to engage the drive shaft 58 of coiling apparatus 10 (not shown).

FIG. 9 illustrates positive electrode 160 being fixed to mandrel 130using an ultrasonic welder 220. In this picture, mandrel 130 is securedby ligature 140 which in turn is secured to the shuttle 100 by placingligature stem 146 (not shown) through the mandrel drive hole 112 (notshown) as discussed above for FIG. 8. Positive electrode 160 andnegative 162 electrode (not shown) are welded to mandrel 130 usingultrasonic welding. Positive electrode 160 is welded to the positiveportion of mandrel 130. Shuttle 100 is rotated, and right portion 102 isinserted into the ultrasonic welder 220 exposing the negative electrode162 (not shown) juxtaposed to mandrel 130 and securely welded in placeby the shuttle covers 118 and 120.

FIG. 10 is a schematic diagram illustrating the connection of positiveelectrode 160 and negative electrode 162 with mandrel 130 after theprocess shown in FIG. 9. The ultrasonic weld of positive electrode 160to positive portion 132 of the mandrel 130 is represented at 182. Theultrasonic weld of the negative electrode 162 with the negative portion134 is on the opposite side of the mandrel 130.

Electrodes 160 and 162 can vary in size, shape and length. Generally theelectrode can be a foil or other thin malleable conductive substrate. Invarious embodiments, the foil can be in the form of a metal foil suchas, for example, aluminum, steel, silver, copper, nickel, titanium, etc.The length of the electrodes can range from about 2 inches to about 20inches, particularly from about 4 inches to about 18 inches and mostparticularly from about 6 inches to about 16 inches. The width of theelectrodes can range from about 0.1 to about 2 inches, more particularlyfrom about 02 to about 1.75 inches and most particularly from about 0.3to about 1.5 inches. The thickness of the electrodes can vary from about0.003 inches to about 0.04 inches, in particular from about 0.004 toabout 0.03 inches and most particularly from about 0.005 to about 0.025inches. The electrodes can vary in composition depending on the batterychemistry being used and the mandrel can be optimized for such.

Positive electrode 160 can be coated with a positive active material184. As illustrated, positive electrode 160 has a proximal end 186 thatis not coated with active material. Proximal end 186 is attached at 182to positive portion 132 of mandrel 130. Similarly, negative electrode162 can be coated with a negative active material 188. Proximal end 190of negative electrode 162 is not coated with active material andfacilitates attachment (not shown) to the negative portion 134 ofmandrel 130. In this embodiment, positive electrode 160 and negativeelectrode 162 are attached to mandrel 130 by ultrasonic welding as shownin FIG. 9. However, those of skill in the art will appreciate thatelectrodes 160 and 162 can be attached by any appropriate means such as,for example, laser welding, ultrasonic welding, resistance welding or aninterference fit or the like.

Those of skill in the art will appreciate that positive active material184 can be any of those materials used as such in electrode technology.For example, positive active material 184 can be lithium cobalt oxide(rechargeable), carbon monofluoride (CF_(x)), silver vanadium oxide(primary), or combinations thereof. Similarly, negative active material190 can be any appropriate negative active material used in electrodetechnology. Exemplary materials include lithium titanate, artificialgraphite powder (MCMB), lithium, or combinations thereof.

Both positive 160 and negative electrodes 162 can be coated on one sideor both sides of the electrode to provide an electron flow suitable togenerate a current. However, those of skill in the art will appreciatethat coating of the electrodes on both sides with active material allowsfor more efficient use of the two sides of the electrodes, resulting inincreased energy and power in contrast to a single side coatedelectrode. It should be understood that the proximal and/or distal endsof the electrodes do not need to be coated on one or both sides. Itshould be appreciated that any suitable combination of coatings andcoated portions of the electrode(s) is within the scope of the inventionand is not limiting.

FIGS. 11A and 11B illustrate electrode assembly header 169 including abattery cover 168, positive feedthrough pin 164 and negative feedthroughpin 166. See for example, U.S. provisional patent application 61/321,693incorporated herein by reference for all purposes. As illustrated inFIG. 11A, positive and negative feedthrough pins 164 and 166 are placedin sleeves 170 and 172 in battery cover 168. In the embodiment shown,sleeves 170 and 172 are made of an electrically conductive material suchas those usable for the feedthrough pins 164 and 166. Sleeves 170 and172 project above the top surface of the battery cover 168, thereforeallowing sleeves 170 and 172 to be used as the positive and negativeterminals of the battery when assembly is completed.

FIG. 11A also shows a header drive barrel 174 having a drive plate 176,a drive barrel clamp 178 and a drive barrel shaft 180. The header drivebarrel 174 is configured to accept electrode assembly header 169. Themating of battery cover 168 and positioning of positive and negativefeedthrough pins 164 and 166 can be asymmetric to allow for only oneorientation of battery cover 168 and feedthrough pins 164 and 166 indrive barrel 174. FIG. 11B shows the underside of battery cover 168 andthe positive feedthrough pin 164 and negative feedthrough pin 166 placedin drive barrel 174 and secured in place with barrel clamp 178.

Feedthrough pins 164 and 166 can be sized to fit within grooves 133 and135 in mandrel 130 and can be made of any electrically conductivematerial. For example, feedthrough pins 164 and 166 can be made ofsteel, platinum, aluminum and titanium, etc. In some embodiments, thefeedthrough pins can be made of an alloy such as, for example,platinum-iridium such as 90 Pt/10 Ir. The length of the positive andnegative feedthrough pins can range from about 0.4 to about 1 inches inlength, more particularly from about 0.5 to about 0.75 inches and mostparticularly from about 0.5 to about 0.7 inches. The diameter of thefeedthrough pins can vary and can be from about 0.050 to about 0.3inches, in particular from about 0.01 to about 0.025 inches and mostparticularly from about 0.01 to about 0.015 inches. The feedthrough pinsextend outside of the battery case and can be cut to length as required.

Once the header assembly 169 has been assembled and fixed to drivebarrel 174 the drive barrel shaft 180 is inserted through the rotatableportion 70 of base 60. The shuttle 100 carrying the mandrel 30 held byligature 140 is then mated with base 60 such that the header assembly169 is juxtaposed to the mandrel 130 with the positive feedthrough pin164 juxtaposed to positive feedthrough groove 133 and the negativefeedthrough pin 166 juxtaposed to the negative feedthrough groove 135 atthe top of the positive portion 132 and the negative portion 134 ofmandrel 130.

FIG. 12 shows base 60 mated with shuttle 100 and prepared for thewelding of the feedthrough pins 164 and 166 to mandrel 130. In FIG. 12,the base plate/shuttle pair 60/100 assembly with header drive barrel 174holding the electrode assembly header 169, has been inserted into a holddown tool 310. Hold down tool 310 includes a closeable clamp 320.Mandrel 130 is held by ligature 140 and ligature stem 148 is insertedthrough the drive hole 112 of shuttle 100. Battery cover 168 (notvisible) is held securely by the barrel clamp 178 and barrel shaft 180has been inserted into the rotatable member 70 of base 60.

FIG. 13 illustrates the same configuration as FIG. 12 except hold downtool clamp 320 has been closed to securely juxtapose positivefeedthrough pin 164 to positive portion 132 of mandrel 130 and negativefeedthrough pin 166 to negative portion 134 of mandrel 130. Also shownis positive electrode 160 which is welded to positive portion of mandrel132 and negative electrode 162 which is welded to negative portion ofmandrel 134 on the opposite side.

FIG. 14 shows the electrode assembly secured in base/shuttle assembly60/100 after welding of electrodes 162/164 to mandrel 130 prior tocoiling. Also shown in this view is passage ‘p’ between the positive 132and negative 134 portions of mandrel 130.

FIG. 15 illustrates coiling device 10 shown in FIG. 1, prior toinsertion of base/shuttle/mandrel 60/100/130 assembly. Also shown inthis view are orientation/locking pins 54 that mate with orientationholes 78 in base 60 securing base 60 to platform pieces 30. Separatorstrip 36 is threaded through upper guide rollers 42 and around the uppertension roller 46. Winding apparatus 20 is configured to mate withligature stem 146. In some embodiments, a winding belt 22 operationallyconnects winding apparatus 20 with a drive shaft 58 which mates withsecondary drive shaft 72 on base 60.

FIG. 16 shows base/shuttle 60/100 assembly, with mandrel 130 placed incoiling device 10 and secured to platform 30. Separator strip 36 isbeing threaded through the mandrel passage ‘p’ (not visible).

FIG. 17 is the same view as FIG. 16 except that separator strip 36 hasbeen passed through mandrel passage ‘p’ and threaded through lower guiderollers 44, lower tension roller 48 and around second spool 34.

FIG. 18 is a close-up view of coiling device 10 at the end of thecoiling process. In FIG. 18, the winding apparatus has turned themandrel approximately 5.5 rotations to coil electrodes 160 and 162 andseparator strip 36 around mandrel 130. A further single rotation ofmandrel 130 provides an outer layer of separator strip 36 that is cutand sealed to itself using heat sealers 50 and 52 to seal the jelly rollassembly. Due to coupling of winding apparatus 20 to winding belt 22,drive shaft 58 (FIG. 15) is also rotated in unison with the windingapparatus 20. The primary drive shaft 58 couples to the secondary driveshaft 72 of the base 60 which turns drive belt 74 to rotating rotatablemember 70 which holds barrel shaft 180. The arrangement illustrated inFIG. 18 rotates mandrel 130 at both removable portion 136, held byligature 140, and at header 169 held by header drive barrel 174. Whilethose of skill in the art will appreciate that the coiling of the jellyroll assembly could be accomplished only by rotation of the mandrel heldby the ligature 130, use of the secondary drive shaft/winding belt 72/74allows for more uniform rotation of mandrel 130. This helps to alleviatetorquing or deformation to provide more reproducible and consistentcoiling of the electrode assembly 200.

In some embodiments, brakes (not shown) on the upper and lower spools 32and 34 apply tension to the separator strip 36. Tension sensors (notshown) in tension rollers 46 and 48 sense tension and provide feedbackto brakes to ensure applied tension matches a desired tension. Separatortension and coiling speed (RPM) are programmed by operating softwareincluding one or more computer chips and electronics in communicationwith the software and chip(s) and can be adjusted for increasedcompactness (greater tension) or less compactness (less tension) asdesired.

Also shown in FIG. 18 are upper and lower heating elements 50 and 52which movably contact the coiled jelly roll assembly. A suitablesoftware program can control cutting separator strip 36 and sealing thestrip to itself along the outer layer of wrap of the jelly roll.

Suitable separator material can be any non-conductive material such aspolyethylene, polypropylene and layered combinations thereof. Theseparator generally has a larger width and length than the electrode(s)it covers so as to fully encase the electrode(s). Suitable separatorshave a length of from about 4 inches to about 36 inches, in particularfrom about 8 inches to about 34 inches and most particularly from about12 inches to about 30 inches and widths of from about 0.2 inches toabout 2 inches, in particular from about 0.3 inches to about 1.75 inchesand most particularly from about 0.4 inches to about 1.5 inches.Suitable thicknesses for separators range from about 0.0008 inches toabout 0.004 inches. Generally, separator 36 can be sized appropriatelyto extend beyond the bottom portion of positive and negative portions132 and 134 after removal of removable portion 136.

FIG. 19 shows coiler 10 configured to run under programmed conditionswhen operatively linked to a computerized human machine interface (HMI).The HMI operates using specialized software such as a Programmable LogicController (PLC) program. Knob 410 is the on/off switch. Knob 420 is anemergency stop (e-stop) to disconnect power to coiling device 10.Display 430 provides a visual output of the program parameters andinformation status including the tension of coiling and the temperatureof the heat stakes. In the embodiment shown, the display is atouch-screen display allowing for use without a keyboard.

FIG. 20 shows the completed jelly roll assembly 200 removed fromligature 130 and prior to removal of removable portion 136. The phrase“removable portion” refers to a portion of mandrel 136 that can bedetached from the remainder of the mandrel 130. This can be accomplishedby scoring a groove deep enough to allow the removable portion 136 to be“snapped off” from the remainder of mandrel 130. Alternatively, theremoval portion 136 can be detached by cutting, breaking, tearing orclipping the portion from the remainder of the mandrel 130.

After jelly roll assembly 200 has been removed from coiler device 10 andremovable portion 136 has been removed, the jelly roll assembly 200 canbe placed in a battery case (not shown). An appropriate electrolyte canbe added to the assembly and the battery cover sealed to the case toprovide a completed battery. It will be appreciated by those of skill inthe art that, because electrodes 160 and 162 and feedthrough pins 164and 166 are in electrical connection with each other, upon completion ofthe battery, the portion of the feedthrough pins 164 and 166 extendingabove the battery cover 168, then become positive and negative terminalsfor the battery.

Various exemplary embodiments of devices and compounds as generallydescribed above and methods according to this invention, will beunderstood more readily by reference to the following example, which isprovided by way of illustration and is not intended to be limiting ofthe invention in any fashion.

Example 1

In operation, the coiler apparatus is used to make an electrode batteryassembly by following these steps.

Ultra-Sonic Weld (USW) Electrodes to Mandrel

-   -   1. Place mandrel in shuttle ligature. Locating (“P”) feature on        mandrel, mate with reverse feature on clamp to ensure proper        orientation.    -   2. Insert ligature into shuttle.    -   3. Orient shuttle on work table facing up.    -   4. On positive side, open both large and small covers.    -   5. Place positive electrode in channel and close large cover.    -   6. With small cover open, adjust the “x” position (along the        path of the track) of the electrode on the mandrel. Once placed        properly, close small cover.    -   7. Flip shuttle assembly over.    -   8. Repeat steps 4-6 with negative electrode.    -   9. Insert shuttle assembly into fixture at an ultra-sonic weld        (USW) station. Locating pins on fixture line up with holes on        shuttle for proper alignment.    -   10. Perform weld of electrode to mandrel.    -   11. Remove shuttle from fixture, flip over, and repeat on        opposite side to weld the other electrode.    -   12. Proceed to laser weld (subassembly remains in Shuttle).

Laser Weld Header Assembly to Mandrel

-   -   13. Place header assembly into barrel for base. Locating        features on barrel ensure proper orientation of header assembly.    -   14. Insert barrel into base.    -   15. Align shuttle with base and mate together. Orientation pins        on base mate with holes on shuttle for proper orientation.    -   16. When mating shuttle and base together, ensure feedthrough        pins from header assembly (base) slide into pin channels in        mandrel (shuttle). Alignment and orientation are controlled by        shuttle/base assembly.    -   17. Insert mated shuttle/base into laser weld fixture. Locating        pins on fixture align with holes on shuttle/bases to ensure        proper alignment and orientation.    -   18. Close clamp on fixture to hold pins from header assembly in        channels on mandrel during laser weld.    -   19. Perform laser weld on each pin.    -   20. Remove shuttle/base combo from laser weld fixture.    -   21. Proceed to coiling station (assembly remains in shuttle/base        combo).

Coiling

-   -   22. Insert Shuttle/Base combo into coiler. Locking pins on        coiler align with holes on shuttle/base combo for proper        orientation and alignment.    -   23. Thread separator over upper spools on coiler, between legs        of mandrel, and over bottom spools on coiler. Secure end of        separator.    -   24. Begin coiling. Brakes on coiler apply tension to separator.        Tension sensors on coiler sense tension and feedback to brakes        to ensure applied tension matches desired tension. Separator        tension and coiling speed (RPM) are programmed and can be varied        throughout the cycle.    -   25. Separator trim/heat seal happens as part of the coiling        program. Heat stake temperature, distance, and speed can be        varied by program to control seal.    -   26. Once cycle is complete, remove Shuttle/Base combo from        coiler.    -   27. Remove coiled battery assembly from Shuttle/Base combo.    -   28. Break off removable portion from mandrel.    -   29. Insert coil into battery case liner and case.

The following paragraphs enumerated consecutively from 1 through 48provide for various aspects of the present invention. In one embodiment,in a first paragraph (1), the present invention provides:

1. A system for preparing an electrode assembly comprising:

a base comprising a right member and a left member connected by acentral member wherein the central member is configured to accept anelectrode assembly header; and

a shuttle, comprising a right portion and a left portion connected by acenter portion, wherein the left portion comprises a cover, the rightportion comprises a cover, and the center portion is configured toaccept a mandrel, wherein the left and right covers are positioned onopposite sides of the shuttle,

wherein the base is configured to mate with the shuttle, such that themandrel mates with the electrode assembly header between the centerportion of the shuttle and central member of the base.

2. The system of paragraph 1, wherein the center portion of the shuttlefurther comprises a ligature to support the mandrel.

3. The system of paragraph 1, wherein the central member furtherincludes a rotatable portion, wherein the rotatable portion isconfigured to accept a portion of the electrode assembly header.

4. The system of paragraph 3, wherein the central member is configuredto accept a drive barrel, wherein the drive barrel includes theelectrode assembly header.

5. The system of paragraph 4, wherein the drive barrel further includesa barrel shaft that rotatably engages with the central member.

6. The system of paragraph 1, wherein one of the left member or rightmember includes a drive shaft, the drive shaft having a first end and asecond end, the second end including a drive belt wherein the drive beltengages the barrel shaft, and the first end is configured to engage witha second drive shaft.

7. The system of paragraph 1, wherein the mandrel comprises a positiveportion, a negative portion, a removable portion connecting the positiveportion and the negative portion and a passage between the positiveportion and the negative portion.

8. The system of paragraph 7, wherein the ligature engages the removableportion.

9. The system of paragraph 8, wherein a body portion of the ligature isconfigured to hold the removable portion of the mandrel.

10. The system of paragraph 9, wherein a stem of the ligature isconfigured to pass through a drive hole in the center portion of theshuttle.

11. The system of paragraph 9, wherein the stem of the ligature isconfigured to engage a winding apparatus.

12. The system of any of paragraphs 1, 2 and 6-11 wherein either theleft portion, right portion or both of the shuttle are configured toaccommodate an electrode strip.

13. The system of any of paragraphs 1-2 and 6-12, wherein the leftcover, right cover, or both are hinged to the shuttle.

14. The system of any of paragraphs 1-2 and 6-13, wherein the leftcover, right cover, or both comprise two or more pieces.

15. The system of any of paragraphs 1-2 and 6-14, wherein the leftcover, right cover, or both and the left portion or right portion orboth of the shuttle are magnetic.

16. A method to secure an electrode assembly header comprising thesteps:

-   -   placing a mandrel into a central portion of a shuttle; and    -   mating the shuttle with a base, wherein    -   the base comprises a right member and a left member connected by        a central member wherein the central member is configured to        accept an electrode assembly header,

the shuttle comprises a right portion and a left portion connected by acenter portion, wherein the left portion comprises a cover, the rightportion comprises a cover, and the center portion is configured toaccept a mandrel, wherein the left and right covers are positioned onopposite sides of the shuttle, and

wherein the base is configured to mate with the shuttle, such that themandrel mates with the electrode assembly header with the center portionof the shuttle and central member of the base.

17. The method of paragraph 16, wherein the center portion of theshuttle further comprises a ligature to support the mandrel.

18. The method of paragraph 16, wherein the central member furtherincludes a rotatable portion, wherein the rotatable portion isconfigured to accept a portion of the electrode assembly header.

19. The method of paragraph 18, wherein the central member is configuredto accept a drive barrel, wherein the drive barrel includes theelectrode assembly header.

20. The method of paragraph 19, wherein the drive barrel furtherincludes a barrel shaft that rotatably engages with the central member.

21. The method of paragraph 16, wherein one of the left member or rightmember includes a drive shaft, the drive shaft having a first end and asecond end, the second end including a drive belt wherein the drive beltengages the barrel shaft, and the first end is configured to engage witha second drive shaft.

22. The method of paragraph 16, wherein the mandrel comprises a positiveportion, a negative portion, a removable portion connecting the positiveportion and the negative portion and a passage between the positiveportion and the negative portion.

23. The method of paragraph 22, wherein the ligature engages theremovable portion.

24. The method of paragraph 23, wherein a body portion of the ligatureis configured to hold the removable portion of the mandrel.

25. The method of paragraph 24, wherein a stem of the ligature isconfigured to pass through a drive hole in the center portion of theshuttle.

26. The method of paragraph 24, wherein the stem of the ligature isconfigured to engage a winding apparatus.

27. The method of any of paragraphs 16, 17 and 21-26 wherein either theleft portion, right portion or both of the shuttle are configured toaccommodate an electrode strip.

28. The method of any of paragraphs 16, 17 and 21-27, wherein the leftcover, right cover, or both are hinged to the shuttle.

29. The method of any of paragraphs 16, 17 and 21-28, wherein the leftcover, right cover, or both comprise two or more pieces.

30. The method of any of paragraphs 16, 17 and 21-29, wherein the leftcover, right cover, or both and the left portion or right portion orboth of the shuttle are magnetic.

31. A coiling device for preparing an electrode assembly comprising:

-   -   a) a winding apparatus;    -   b) a platform on the coiling device configured to hold an        unwound battery assembly comprising a mandrel, the mandrel        including a positive portion, a negative portion and a removable        portion connecting the positive portion to the negative portion        and a passage in between the negative portion and the positive        portion;    -   c) a first spool, wherein the first spool provides a separator        strip;    -   d) a second spool, wherein the second spool accepts the        separator strip; and    -   e) one or more heating elements,

wherein the separator strip is threaded through the passage between thepositive portion and the negative portion of the mandrel.

32. The coiling device of paragraph 31, wherein the platform isdimensioned and configured to hold a base and a shuttle assembly holdingan unwound battery electrode assembly.

33. The coiling device of either of paragraphs 31 or 32, wherein theplatform is between the first and second spool such that the separatorstrip provided by the first spool bisects the platform when accepted bythe second spool.

34. The coiling device of any of paragraphs 31-33, further comprising abrake system on the first spool and/or the second spool.

35. The coiling device of any of paragraphs 31-34, further comprising atension roller between the first spool and the winding apparatus and/ora tension roller between the second spool and the winding apparatus.

36. The coiling device of paragraph 35, further comprising software toprogram a desired tension on the brake system.

37. The coiling device of paragraph 36, further comprising a feedbackloop between the tension rollers and the brake system.

38. The coiling device of any of paragraphs 31-37, further comprising anuptake spool configured to accept a backing from the separator strip.

39. The coiling device of any of paragraphs 31-38, further comprising awinding belt attached to the winding apparatus.

40. The coiling device of paragraph 39, further comprising a drive shaftconfigured to be driven by the winding belt.

41. The coiling device of any of paragraphs 31-40, further comprisinglocking pins configured to secure a base to the platform.

42. The coiling device of any of paragraphs 31-41, wherein the coilingdevice is under operational control of a computer.

43. The coiling device of paragraph 42, wherein the computer comprises ahuman machine interface.

44. A method of making an electrode assembly comprising:

-   -   providing a ligature, the ligature configured at a first end to        secure a removable portion of a mandrel wherein the mandrel        comprises a positive portion, a negative portion and a removable        portion connecting the positive portion and the negative portion        and including a passage between the positive portion and the        negative portion;    -   providing a stem on a second end of the ligature configured to        pass through a drive hole in a shuttle, wherein the shuttle        comprises a right portion and a left portion connected by a        center portion;    -   providing a positive electrode in a first portion of the shuttle        so that an end of the electrode contacts the positive portion of        the mandrel;    -   providing a negative electrode in a second portion of the        shuttle so that an end of the negative electrode contacts the        negative portion of the mandrel;    -   welding the positive electrode to the positive portion of the        mandrel and welding the negative electrode to the negative        portion of the mandrel;    -   providing a base, the base having a right member, a left member        and a central member comprising a rotating assembly;    -   placing an electrode assembly header in a drive barrel, the        drive barrel including a drive shaft configured to mate with the        rotating assembly of the base;    -   mating the drive shaft with the rotating assembly;    -   mating the shuttle with the base;    -   welding the electrode assembly header to the mandrel;    -   mounting the base, including the shuttle and the mandrel on a        coiling device so that the stem of the ligature is connected to        a winding apparatus;    -   passing a separator strip through the passage between the        positive portion of the mandrel and the negative portion of the        mandrel;    -   rotating the mandrel such that the positive electrode, separator        strip and negative electrode are coiled around the mandrel; and    -   sealing an exposed end of the separator strip to an outer layer        of separator strip such that the coil is sealed,    -   such that a coiled jelly roll electrode assembly is provided.

45. The method of paragraph 44, further comprising:

-   -   connecting a driver on the base with the winding apparatus, the        driver on the base in rotatable connection with the drive        barrel.

46. The method of either paragraph 44 or 45, wherein the electrodeassembly header includes a battery cover and a positive feedthrough pinand a negative feedthrough pin.

47. The method of any of paragraphs 44-46, wherein the coiling deviceoperatively links the winding apparatus with a first spool holing theseparator strip and a second spool accepting the separator strip.

48. The method of paragraph 47, wherein brakes on the first spool andthe second spool adjust the tension on the electrode assembly as themandrel is rotated. Although the present invention has been describedwith reference to preferred embodiments, persons skilled in the art willrecognize that changes may be made in form and detail without departingfrom the spirit and scope of the invention. All references citedthroughout the specification, including those in the background, areincorporated herein in their entirety. Those skilled in the art willrecognize, or be able to ascertain, using no more than routineexperimentation, many equivalents to specific embodiments of theinvention described specifically herein. Such equivalents are intendedto be encompassed in the scope of the following claims.

What is claimed is:
 1. A coiling device comprising: a) a windingapparatus; b) a platform on the coiling device configured to hold anunwound battery assembly comprising a mandrel, the mandrel including apositive portion, a negative portion and a removable portion connectingthe positive portion to the negative portion and a passage in betweenthe negative portion and the positive portion; c) a first spool, whereinthe first spool provides a separator strip; d) a second spool, whereinthe second spool accepts the separator strip; and e) one or more heatingelements, wherein the separator strip is threaded through the passagebetween the positive portion and the negative portion of the mandrel. 2.The coiling device of claim 1, wherein the platform is dimensioned andconfigured to hold a base and a shuttle assembly holding an unwoundbattery electrode assembly.
 3. The coiling device of claim 1, whereinthe platform is between the first and second spool such that theseparator strip provided by the first spool bisects the platform whenaccepted by the second spool.
 4. The coiling device of claim 1, furthercomprising a brake system on the first spool and/or the second spool. 5.The coiling device of claim 1, further comprising a tension rollerbetween the first spool and the winding apparatus and/or a tensionroller between the second spool and the winding apparatus.
 6. Thecoiling device of claim 5, further comprising software to program adesired tension on the brake system.
 7. The coiling device of claim 6,further comprising a feedback loop between the tension rollers and thebrake system.
 8. The coiling device of claim 1, further comprising anuptake spool configured to accept a backing from the separator strip. 9.The coiling device of claim 1, further comprising a winding beltattached to the winding apparatus.
 10. The coiling device of claim 9,further comprising a drive shaft configured to be driven by the windingbelt.
 11. The coiling device of claim 1, further comprising locking pinsconfigured to secure a base to the platform.
 12. The coiling device ofclaim 1, wherein the coiling device is under operational control of acomputer.
 13. The coiling device of claim 12, wherein the computercomprises a human machine interface.
 14. A coiling device comprising: a)a winding apparatus; b) a platform on the coiling device configured tohold an unwound battery assembly comprising a mandrel, the mandrelincluding a positive portion, a negative portion and a removable portionconnecting the positive portion to the negative portion and a passage inbetween the negative portion and the positive portion; c) a first spool,wherein the first spool provides a separator strip; d) a second spool,wherein the second spool accepts the separator strip; e) one or moreheating elements; f) a brake system on the first spool and/or the secondspool; and g) a tension roller between the first spool and the windingapparatus and/or a tension roller between the second spool and thewinding apparatus; wherein the separator strip is threaded through thepassage between the positive portion and the negative portion of themandrel, wherein the platform is dimensioned and configured to hold abase and a shuttle assembly holding an unwound battery electrodeassembly and the platform is between the first and second spool suchthat the separator strip provided by the first spool bisects theplatform when accepted by the second spool.
 15. The coiling device ofclaim 14, further comprising an uptake spool configured to accept abacking from the separator strip.